Your Apple TV streams video and music, but it stores apps locally. The more apps you download to Apple TV, the more storage is used up. At some point, you may get a warning that you’re running out of disk space. If so, you can remove apps to free up space.
You can set Apple TV to remove unused apps to save space. Removing apps preserves your documents and data in case you download an app again later.
Go to Settings next to an app you want to delete.
Do either of the following:
Select Delete to delete the app and all its data from your Apple TV.
Select Offload to remove the app but keep its data.
If you delete an app, you can Install or delete apps on Apple TV